With VOCALENDAR, you will be able to view all events/games/CDs and others all related to VOCALOID. You won't have any worries of missing anything ever again. The app also has a search function so you can search for a specific date. Each event is clickable and provides you a link to the official website of the event. The settings are well designed and you can customize the application to your liking. However the only drawback is that the news/events is only available in Japanese, the settings UI however, is in English.

Since this app is still in beta, do remember to give your feedback to the VOCALENDAR team!